diff --git a/src/Monomorphizer/Monomorphizer.hs b/src/Monomorphizer/Monomorphizer.hs
index 051641e..a217b87 100644
--- a/src/Monomorphizer/Monomorphizer.hs
+++ b/src/Monomorphizer/Monomorphizer.hs
@@ -47,7 +47,7 @@ monoType (T.TAll _ t) = monoType t
 monoType (T.TVar (T.MkTVar i)) = M.TLit "Int"
 monoType (T.TLit (T.Ident i)) = M.TLit (Ident i)
 monoType (T.TFun t1 t2) = M.TFun (monoType t1) (monoType t2)
-monoType (T.TData _ _) = error "Not sure what this is"
+monoType (T.TData (T.Ident n) t) = M.TLit (Ident (n ++ concatMap show t))
 
 monoexpt :: T.ExpT -> M.ExpT
 monoexpt (e, t) = (monoExpr e, monoType t)
diff --git a/test_program b/test_program
index 33f69ce..b43a99a 100644
--- a/test_program
+++ b/test_program
@@ -1,46 +1,9 @@
-data List (a) where {
-    Nil : List (a)
-    Cons : a -> List (a) -> List (a)
-};
+data Bool () where {
+    True : Bool ()
+    False : Bool ()
+   };
 
--- data Bool () where {
---     True : Bool ()
---     False : Bool ()
---    };
-
--- hello_world = Cons 'h' (Cons 'e' (Cons 'l' (Cons 'l' (Cons 'o' (Cons ' ' (Cons 'w' (Cons 'o' (Cons 'r' (Cons 'l' (Cons 'd' Nil)))))))))) ;
-
--- length : List (a) -> Int ;
--- length xs = case xs of {
---     Nil => 0;
---     Cons x xs => length xs;
--- };
-
--- head : List (a) -> a ;
--- head xs = case xs of {
---     Cons x xs => x;
--- };
-
--- firstIsOne : List (Int) -> Bool () ;
--- firstIsOne xs = case xs of {
---     Cons x xs => case x of {
---             0 => True;
---             _ => case xs of {
---                     Cons x xs => False;
---                     _ => False;
---                 };
---             };
---     _ => False;
---     };
-
--- main = firstIsOne (Cons 1 Nil);
-
--- test xs = case xs of {
---     1 => 0;
---     lol => 1;
-                     -- };
-
-deepList xs = case xs of {
-    Cons Nil _ => 1 ;
-    _ => 0 ;
-};
+main = case True of {
+    True => 1;
+    False => 0;
+                      };